There are ____ basic methods for mixing oxygen and fuel gas to form a hot, uniform flame.
A. two
B. three
C. four
D. five
Answer: A
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Answer the following statement(s) true (T) or false (F)
1. In the reversing starter, both mechanical and electrical interlocks are used to prevent both starters from closing their line contacts at the same time. 2. A DC motor will generally require more maintenance than an AC motor. 3. The difference between synchronous speed and actual rotor or motor speed is referred to as slip and is normally expressed as a percent of synchronous speed. 4. A servo drive is the least complex type of variable frequency drive system available. 5. The decision makers are used to perform the work that must occur as the machine sequences through its operations.
What must be done when charging a zeotropic refrigerant into an operating system?
a. Charging by superheat b. Charging liquid through a metering device into the suction service port c. Inverting the refrigerant cylinder d. Adding charge only through the high-pressure side
Profile tolerance is used to control only form
Answer the following statement true (T) or false (F)
Fenestration in general, and windows in particular, affect efficiency and comfort through four specific principles: radiation, convection, conduction, and ____.
A. air leakage B. conversion C. reduction D. reflection